My Rails server only works when the pg gem is uninstalled - ruby-on-rails

Question

I'm quite new to Ruby (and Rails) and I've been trying to set up a Rails server that accesses a PostgresQL database on Windows. I apologize in advance if I'm missing something obvious. I am using the most recent Windows release of Ruby 2.3.0p0, and the most recent PostgresQL version, 9.6 Beta 2.
I've been following this guide somewhat loosely, as it is written for Ubuntu. I installed Ruby, the Rails gem and dependencies without a hitch. Basically, everything goes fine until I go to run the
rails server
command, and my command prompt complains that the specified module can't be found. I had the pg gem installed, so I tried a variety of fixes I found, such as putting libpq.dll in the ruby/bin folder, creating a 2.3 folder, and so on. Nothing worked until I removed the actual pg gem itself, whereupon my server magically booted up. I suspect that the pg gem was overriding the pg version installed by the
bundle install
command automatically run after the
gem install pg
but I'm not actually sure what was going on. Could someone clue me in on the details?
EDIT, some debugging info:
With the vanilla pg gem, rails s gives:
C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/pg-0.18.4-x64-mingw32/lib/pg.rb:14:in `require': cannot load such file -- 2.3/pg_ext
After copying the 2.2 folder to a 2.3 folder, rails s gives:
C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/pg-0.18.4-x64-mingw32/lib/pg.rb:14:in `require': 126: The specified module could not be found. - C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/pg-0.18.4-x64-mingw32/lib/2.3/pg_ext.so (LoadError)
gemfile:
source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.6'
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.15'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use Unicorn as the app server
# gem 'unicorn'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> in views
gem 'web-console', '~> 2.0'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
database.yml:
default: &default
adapter: postgresql
encoding: unicode
pool: 5
development:
<<: *default
database: website_development
test:
<<: *default
database: website_test
production:
<<: *default
database: website_production
username: website
password: <%= ENV['WEBSITE_DATABASE_PASSWORD'] %>
I haven't actually linked the database to Rails yet; I wanted to make sure the Rails side was actually working first.
EDIT2:
I realized that MarsAtomic said PATH and not LOADPATH, and I realized that ruby wasn't in my PATH for some reason. However, it still doesn't work after adding ruby/bin to my PATH. I'm beginning to think that Windows is rejecting the .so file or something, because when I put a .rb file in the same location, it finds that without problem. I also ran file on the .dll and .so, and it reports that they are both PE32+, and my ruby is also 64-bit, so I don't think it's an architecture issue either.

Answer 1

It wasn't an architecture thing, but it was close. I believe the reason it couldn't load the module is because the pg_ext.so in question was compiled for Ruby 2.2 and I am using Ruby 2.3. Upgrading to pg 0.19-pre seemed to resolve the issue.
EDIT: I just found out how to build native extensions and I tried it out the pg 0.18.4 package. (extconf.rb -> devkit's make). I took the .so that was generated and placed it in the 2.3 folder. It didn't ask for the .def but I might need it once I actually link to my database.

Answer 2

If not working on gem 'pg' then try to gem 'postgresql' OR gem install postgresql just see working properly or no
Thanks